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: Thill Coupling.

No. 83,511. Y I Patented Oct. 27,1868.

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WILSON KNOWLES, OF PLANTSVILLE, CONNECTICUT.

I Letters Patent No. 83,511, dated October 27, 1868; omtedatcd October 17, 1868.

IMPROVEMENT IN THILL-COUPLING.

The Schedule referred to in these Letters Patent and making part of the same...

- Coupling; and I do hereby declare that the follow- Ring is a full, clear, and exact description thereof, "which will enable others skilled in the art to make and use the same, referencebeing had to the accompanying drawings, makinga part of this specification, in which Figure 1 is a front view of the forked or eared piece,

of my invention.

Figure Zis a front view of a part of my in vention,

with the eared piece removed.

Figure 3 is a top view of my invention.

Similar letters of reference indicate like parts.

My invention consists in the peculiar construction of the joint of a thill-coupling, whereby I am enabled to produce an article of great durability, and one in which the parts most subject to wear can be're'placed with but trifling expense.-. t A designates a ferked or cared piece, having square holes throughits ears.

B designates an eye-piece, which fits between the ears of the piece A.

E designates a bolt, having a threaded portion on one end, and a head upon the other. Between the two ends the bolt is squared, of such size as to fit the holes in the ears of the piece A.

F designates a nut, which screws upon thethreaded portion of the bolt E.

Y D designates a leatheror'elastic tube.

C designates a cylindrical centre-piece, which fills the axial space of thetube D. This centre-piece has a square hole made through its centre longitudinally, and of the same size as the holes through the pieceA.

' My invention is constructed in the following man- After the forgings are procured, the hole in the eyepiece B is bored of proper size for the tube D. The tube D, I make or a flat piece of leather, or raw hide, or. any other analogous substance. be of such length-and breadth as to form a tube of the same diameter as the hole in the eye-piece B, and of the same length as the breadth of the eye-piece B.

The cylindrical centre-piece C has the square axial holemade through its centre, after which it is turned upon a square mandrel, so as to fit the inside diameter of the tube D,'and of such length as the breadth of the eye-piece B. The leather or elastic tube D and cylindrical centre-piece C are now inserted in the hole in the eye-piece B, after which the sides of the eyepiece B, with the ends of the tube D and centre-piece C,- are filed or dressed to fit closely between the ears of the cared piece A. The cylindrical centre-piece 0 should now be pushed out of the hole in the eye-piece B, when the sides of the eye-piece should be slightly smoothed, so as to allow it to move easily between the ears of the piece A. a

By this method the eye-piece B will be made slightly less iubreadth than. the length of the centre-piece C.

The bolt is made in the usual manner, the squared portion, between the head and threaded portion, being This piece should part soonest worn.

made-alittle less in length than the distance from the "outside of one ear to the outside of the other of the cared piece A.

The parts of my invention are put together in the following manner:

The centre-piece C is first inserted in the tube D. The tube D and centre-piece C are next inserted into the hole in the eye-piece B, and in such position as shown in fig.'2. The eared piece A'is now pushed astride of the eye-piece B, and in such position as that the square hole of the centre-piece 0 will coincide with the square holes in the ears of the piece A. The squared portion of the bolt E is now pressed into the coinciding holes, leaving the threaded portion of the boltE projecting out from one ear. Upon this threaded portion the nut F is now screwed until it presses firmly on the ear. In this manner the ears of the cared piece A are drawn towards each, between the head of the bolt E and nut F, and, as the cylindrical centre-piece C is (after the sides of the eye-piece B have been smoothed) slightly longer than the breadth of the eyepiece B, the sides are firmly pressed against the ends of the cylindrical centre-piece 0, thus leaving the eyepiece B to move easily'between the ears of the eared piece A.

The centre-piece C, if desired, can be made large enough 'to fill the holein the eye-piece B, and the tube D dispensed with.

It will be readily seen that the centre-piece C and bolt E will be held rigid and immovable in their place equally as well either withor without the tube D.

By my invention I produce an article of great durability, and amable to construct a thill-coupling in which the parts subject to wear can be readily replaced at a trifling expense.

The principal wearing-surfaces are on the tube D and centre-piece C.

The centre-piece C can be made of hardened steel or case-hardened iron.

As the tube Dis made of soft material, as compared with the metal centre-piece C, it will be the part soonest. Worn.

The tube D can be easily made and adjusted by any person of common ability.

In the thill-coupling in common use, the bolt is the The expense of fitting a bolt, to replace the worn one, is much greater than that of fitting a leather tube.

By my invention I am also able to make the bearing-surfaces of the joint larger than those of the thincoupling in common use, thus making an article of great durability.

I do not claim the cared piece A, eye-piece B, bolt E, nut F, and tube D, either separately or combined WILSQN W. KNOWLES.

Witnesses:

ANDREW RQBLATCHLEY, Jennie E. BLATOHLEY; 

